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I have been testing a prototype tank from Luxfer which is rated at 4500 psi, a DIN valve was required. All tanks with 3500 psi ratings that I have seen come with DIN valves (ie. sherwoods). I'm not sure but I was told that by DOT specifications yoke valves are are rated to 3300 psi and DIN valves are rated to 5000 psi. At 04:32 PM 9/22/95 +0000, you wrote: >> Date: Fri, 22 Sep 95 11:54:49 -0700 >> Subject: Re: J-valves - word of caution >> From: Kevin-Neil Klop <uunet!apple.com!kevink> >> To: <uunet!terra.net!techdiver> > >> >I have remove all the "K" valve from my personal tanks and replaced them >> >with DIN (DIN 300) valve. Din valve provide a much more solid attachment >> >point for a regulator. >> >> >> Here's an assertion that I'm not too sure of. Why are the thin threads >> of the DIN valve so much more secure than the threads on the yoke screw >> and/or the brass form on the yoke itself? Note that I dive with a DIN >> valve, I'm just not sure that it's all that much more secure than a >> properly designed yoke. >> >> Question: What do they use on YOUR DIN valve to fill it? On mine, they >> use a fill block and a (yep) yoke. >> > > >When I get fills on my high pressure 120's they have a hose set up >for DIN dittings. These fittings have a "service pressure" of >3500psi. The yokes that I have seen have a "service pressure" of >3000psi. > >I have also seen some people use the block to attach their yoke >regulator. Another 'O' ring to fail. And again the pressure in >these tanks is over the rated pressure of the yoke they are >attaching. >More McCormack >mmccormack@sb*.co* >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. > >
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